DRILL & BLAST | TECHNICAL


Below:


Photo of Standpipe Installation


ALL IMAGES COURTESY IPI PACKERS


PEG SAVINGS FROM NEW STANDPIPE SOLUTIONS


Two types of high-pressure, grout-free standpipes developed for pre-excavation grouting (PEG) in recent years are discussed by Joel Adams, Director (Mine, Water, Geotech) with IPI Packers


Drill-through standpipes are a critical component of groundwater control in pre-excavation grouting (PEG), providing a means to safely advance drill holes that intersect high-flow and high-pressure zones. The conventional approach to installing standpipes


is to drill a short pilot hole and grout a pipe fitted with centralizers in place. Once the grout has cured, which in some cases can require 24 hours, the grout seal can be pressure tested. Emplacing grout seals in horizontal boreholes can be


particularly challenging and often require multiple grout treatments to achieve an effective seal. To address these challenges, two types of grout-free standpipes have been developed in recent years:


Spring 2023 | 41


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